IBKR’s US overnight trading sessions observe the New York Stock Exchange’s ("NYSE") holiday schedule in that IBKR will not operate an overnight trading session when the NYSE is closed the next day (e.g., if the NYSE is closed on a Friday, IBKR will not operate a trading session that Thursday evening/Friday morning). IBKR does not adjust the overnight trading hours of operation on days the NYSE has a scheduled early close. For trading sessions starting on days the NYSE is closed per the NYSE holiday schedule, the Alternative Trading System (ATS) accepts orders from 5:30 PM ET and effects transactions from 6:00 PM ET until 3:50 AM ET the following morning.
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